2020 macbook pro cannot connect uploading to board

I am a newbie Arduino world. I have macbook pro Big Sur OS and Arduino Uno kit, just installed arduino ide software to the computer. I wrote the first "Hello WORLD"code, but I get the following error message
Error opening serial port /dev/cu.usbmodem14401
"uploading to board". Arduino: 1.8.13 (Mac OS X), Board: "Arduino Uno"

Sketch uses 1622 bytes (5%) of program storage space. Maximum is 32256 bytes.
Global variables use 204 bytes (9%) of dynamic memory, leaving 1844 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "/dev/cu.usbmodem14401": Resource busy
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

How can I solve this problem, I am awaiting your help with great gratitude.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

How can I solve this problem, I am awaiting your help with great gratitude.

What have you tried? Going through a list of the many things it could be would waste our time, and your's.

Lets start at the begining :

Have you restarted your computer?

BIGSUR has its own issues and there are lots of questions that cover the issue with many fixes.

Please use the SEARCH (upper right of screen) to see those.

Could you also take a few moments to Learn How To Use The Forum.

Other general help and troubleshooting advice can be found here.
It will help you get the best out of the forum in the future.

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